1) 17/100=0,17 ;17/9=1,(8) ;17/8=2,125
2) 5,34=534-5/100=529/100 ;5,3(4)=534-5/9=529/9 ;5,(34)=534-5/99=529/99 apropo vezi ca se pot simplifica
3) x+1/5=8/10; x=8/10-1/5 amplifici pe 1/5 cu 2=8/10-2/10=6/10 simlifici prin 2=3/5
4)5/8+5/6 amlifici primul cu 8si al doilea cu 6=30/48+40/48=70/48 simlifici prin 2 =35/24
5)15intregi2/5=77/5; 21-77/5=105/5-77/5=28/5
6)7,243mai mic decat 7,2(4)
7) 3636/2121simlifici prin 3=1212/707